if (document.images) {
	 btn_0on= new Image();
     btn_0on.src="/images/varie/menu_link_b.gif";  
     btn_0off= new Image();
     btn_0off.src="/images/varie/menu_link_a.gif";

  }

function lightup(imgName) {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName) {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
	 }
 }